>>16918835set your mind on things above
you have statistically zero influence on what your emotions want
but you have control (by the grace of God - so ask for His help and obey what His Word says) on what you set your mind on.
So set your mind on "things above" (which should mean, to start, read Revelation chapter 4 & 5 and ponder that scene) and your heart (i.e. emotions) will follow suit.